I wiggle the yellow wires there and it seems to reproduce the problem! I get my soldering iron out, reflow the solder on the yellow wires attaching to that switch. I finally trace it to a stand up target on the far left. I start cutting tie straps following the wire. Time to start tracing the yellow/white wire (the row wire).
Since it's also triggering switch row 5 col 2 (to the left of the VuK switch), it must be an issue on the same row. After swapping the board with the other one, pounding the playfield - same switch. Swap the two boards, see if the same switch triggers still or if the problem moves to the other column with the movement of the opto board. Since there are two in this system, it should be simple. Now I want to eliminate the opto board itself. I restore the cables to their original locations. Ok, pounding the playfield the problem remains on the same switch. If it's the opto itself, rather than the same switch triggering, the one where the orange is at will trigger (left ramp exit). I switch the yellow plug with the orange one. Let's start by ruling out the opto itself. So the yellow connector goes to the white/yellow wire pair. They are also colored the color of the wires on the row. The connectors on these boards are not keyed, but they are colored. There are two of these one for column 3 and one for column 2. This board takes a bunch of opto connectors and outputs them onto the switch matrix. I trace the wires down to the opto power board. Seems when I wiggle the wires, the switches trigger. I lift the playfield and start wiggling wires. Further examination shows that when this switch triggers, the one in the same row to the left of it also triggers. However, when I pound on the playfield, the switch toggles a bunch of times! Here is the problem.
#Wizard of oz pinball machine driver#
However when I poke a screw driver in the VuK, the switch toggles. I notice it's yellow which means "inactive opto".
The switch seems to be on drive 3, return 5. The switch menu on WoZ is very elaborate (and neat). But the VuK is constantly firing intermittently throughout the game play.įirst thing we do is enter the switch test.
When the ball enters the left most horse path, the VuK correctly fires out the ball.
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